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Eosinophil-mediated cholinergic nerve remodeling.

Niamh Durcan1, Richard W Costello, W Graham McLean

  • 1Department of Medicine, Royal College of Surgeons in Ireland, Beaumont Hospital, Dublin, Ireland.

American Journal of Respiratory Cell and Molecular Biology
|February 4, 2006
PubMed
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Eosinophils interacting with cholinergic nerves promote neural remodeling by upregulating M2 muscarinic receptors and altering acetylcholine metabolism. This suggests eosinophils can induce a cholinergic phenotype in nerves during inflammation.

Area of Science:

  • Neuroimmunology
  • Cellular and Molecular Neuroscience

Background:

  • Eosinophils accumulate near cholinergic nerves in inflammatory diseases.
  • Eosinophil signaling is implicated in inflammatory conditions like asthma and inflammatory bowel disease.

Purpose of the Study:

  • To investigate if eosinophil localization to cholinergic nerves induces neural remodeling.
  • To identify molecular mechanisms underlying eosinophil-mediated neural changes.

Main Methods:

  • Co-culture of eosinophils with cholinergic IMR32 cells.
  • Analysis of M2 muscarinic receptor and cholinergic gene expression.
  • Investigation of promoter regions and transcription factor binding sites.
  • Measurement of intracellular acetylcholine and choline levels.

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Main Results:

  • Eosinophil co-culture increased M2 muscarinic receptor expression via adhesion-dependent protein release (MBP, NGF).
  • Induction of M2 receptor expression was initiated at a distal promoter site (145 kb upstream).
  • Eosinophils upregulated cholinergic genes (ChAT, VAChT, AChE) and altered acetylcholine metabolism, increasing turnover and reducing catabolism.

Conclusions:

  • Eosinophil localization to cholinergic nerves induces significant neural remodeling.
  • This remodeling promotes a cholinergic phenotype, potentially influencing nerve function in inflammatory settings.
  • Eosinophil-derived proteins play a key role in mediating these neural adaptations.